Reaming-tool.



H. RUTH'EMEYER.

REAMING TOOL. APPLICATION FILED SEPT- I8, 1915.

Patented May 16, 1916.'

amnmtoz R E Y E M E H T. U DH pr r l Flflf@ l REAMING-TOOL.

Application filed September 18, 1915.

To all whom it may concern Be it known that I, I'IERMAN RUTHEMEYER, a citizen of the United States, residing at Covington, in the county of Kenton and State of Kentucky, have invented certain new and useful Improvements in Beaming- Tools, of which the following is a specification, reference being had to the accompanying drawings.

This invention comprehends certain new and useful improvements in reaming tools and relates particularly to an improved device of this character designed for use in reaming out a hole after it has been drilled so as to make it larger at the bottom or back than in front for use with expansive shields, although it is to be understood that the invention is applicable for other uses.

The invention has for its primary object a durable and eflicient construction of tool of this character, the parts of which may be easily manufactured and readily assembled and not liable to get out of order and which may be used with facility for its desired purpose and which will be entirely devoid of springs or similar devices which are likely to become broken and otherwise make the tool useless. And the invention also aims to gene-rally improve devices of this class so as to render them more useful and commercially desirable.

\Vith these and other objects in view, as will more fully appear as the description proceeds, the invention consists in certain constructions, arrangements and combina tions of the parts that I shall hereinafter fully describe and claim.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawing, in which Figure 1 is a longitudinal sectional view of a reaming tool constructed in accordance with my invention, parts being shown in side elevation. Fig. 2 is a side elevation of the device and also shows in section a bushing which may be slipped over the tool and used therewith. Fig. 3 is a longitudinal sectional view at right angles to the section of Fig. 1, and Fig. 4 is an end view of the stem or bar of the device.

Corresponding and like parts are referred to in the following description and designated in the different views of the accom- Specification of Letters Patent.

'cally arranged recesses 7, as shown.

Patented May 16, 1916.

Serial No. 51,362.

1panying drawing by like reference characters.

My improved reaming tool comprises a preferably cylindrlcal stem or bar 1 whlch j is formed at one end with a shank 2 designed for insertion in the end of a brace, as is customary. The other end of the stem 1 is with longitudinally disposed and diametri- The stem 1 and sleeve 6 are adapted to have a lnmte-d longltudinal movement relative to 'each other, said movement being limited by means of a set screw 8, which works through the sleeve 6 and into a preferably beveled recess 9 formed in the stem, said set-screw not only serving to limit the range of relative movement between the two parts, but also capable of holding them rigidly connected together in different desired adjusted positions, as is manifest.

Preferably the tool embodying the principles and improvements of my invention is made in a plurality of sizes as, for example, three sizes, namely, a one-quarter inch size, a one-half inch size, and a threequarter inch size. By means of a bushing 10 which is adapted to be slipped over and upon the sleeve 6 and which is formed with longitudinally and diametrically arranged slots 11, designed to provide clearances for the knives or blades at, the one-quarter inch drill can be used up to a half-inch drill, the half-inch drill can be used up to three quarters, and the three-quarters up to one inch, the bushing holding the reamer in the center of the hole, in an obvious manner. It is to be understood however that this bushing is not essential and that it may be used only when the circumstances of the case may require.

As best illustrated in Fig. 1, the longitudinal slots 7 in the sleeve 6 terminate at one end of the sleeve in oppositely beveled shoulders 12 designed to be engaged by the beveled ends 13 of the blades 4;, whereby, when the stem 1 is pressed inwardly, as is manifest, the blades will be forced outwardly to engage the wall of the opening and make the desired taper. If it is desired that the hole shall be long tapered, the operator will first ream the hole in the back and then tighten the set screw 8 and pull the device toward him as he turns the brace.

From the foregoing description in connecti on with the accompanying drawing, the operation of my improved reaming tool will be apparent.

In the practical use of the device, it is placed in a brace and a tool placed in the hole and the operator will then press slightly inward which makes the lmife eX- pand and ream out the opening. If a long tapered hole is desired, the set screw 8 is brought into play as above described, and if desired the bushing 10 may be used for the purpose hereinbefore mentioned.

While the accompanying drawing illustrates what I believe to be the preferred embodiment of my invention, it is to be understood that the invention is not limited thereto but that various changes may be made in the construction, arrangement and proportions of the parts without departing from the scope of the invention, as defined in the appended claims.

What is claimed, is:

1. A reaming tool of the character described, comprising a cylindrical stem provided at one end with a shank for insertion in the end of a brace and formed at its other end with a transverse recess and intermediate of its ends and on one side with another recess, blades pivotally mounted at one end in the end recess of the stem, a sleeve mounted upon said stem, a set screw working through the sleeve and received in the intermediate recess of the stem, said sleeve being formed with slots for the passage of the blades and at one end with oppositely beveled shoulders with which the free ends of the blades are adapted to engage.

2. A reaming tool of the character described, comprising a stem, a sleeve in which said stem is mounted, blades pivotally connected at one end to one end of said stem, the sleeve being formed with longitudinal openings for the passage of the blades and at one end with beveled shoulders with which the ends of the blades are adapted to engage, and a bushing insertible over the sleeve and formed with diametrically disposed slots, for the purpose specified.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

HERMAN RUTHEMEYER.

\Vitnesses:

G100. J. lVIEsEHons'rEn, M. WVILDE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

